#include <stdio.h>

int main() {
    int day = 9;
    int peaches = 1;
    
    while (day > 0) {
        peaches = (peaches + 1) * 2; 
        day--;
    }
    
    printf("第一天共摘了 %d 个桃子\n", peaches);

    return 0;
}
